Sample Apache virtual host to proxy subdomain to docker container

000-default.conf

<VirtualHost *:80>
        ServerAdmin [email protected]
        DocumentRoot /var/www
        ServerName docker.example.com
        ErrorLog logs/docker.example.com_error.log
        CustomLog logs/docker.example.com_access.log combined
        ProxyPreserveHost On
        ProxyRequests off

        <Location />
                ProxyPass http://localhost:9000/
                ProxyPassReverse http://localhost:9000/
                Order allow,deny
                Allow from all
        </Location>
</VirtualHost>